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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '896fb35ece1c96e10ccb25d66695d94065af9424a2dbf0dfeb270426fe95c775' 
  AND token = 'T/B82lXTm2qombb9+angctiomKHdkuMn7GV6q34hrcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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