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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caf7fc19b41ade863159ea4bd3e4fceeb80591ca26e1f93961e89090361de3c8' 
  AND token = '7Zykz2d1ITvA78aFEBEnNG/IknnD5ya6tGuUTa8vlLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}