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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5098b2a2ac59a7702787ebf5708bc4f8e80b6406db1d65728a051ed306b5282e' 
  AND token = 'xkCxVT4aFgKDyT6EtpTMFbIDuXd+wjC1DVGBQpvl1MA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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