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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc15ce20d6bc619b5c8fa05dd97d72bcc2b3e90d1fa8488195f7c9fb6d6b7e2d' 
  AND token = 'E85bQ/N67spRHDZ4Nv6BuzqiC1s9jrdcbT1wMSmZ8E0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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