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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '334d1ce9fd5e69997c31e5c72b789ed902bde87d9fbcd85f7b8fa8c70a465f91' 
  AND token = 'HoDKP16MdoC5p6dA2zub9jzK3w6VsskUEnSnxKz4QLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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