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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61c4db5830e42b1ee096481fdddb98a2d22dd007961e81d0915184ec35ec9068' 
  AND token = 'wi5VS0CvU6HUPggq1/QbszkIf4wf91YFaihE38ceRuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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