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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab5eb96ac3fbf902a5b41f30e56945951658da5771bd937daf07a8635a73e187' 
  AND token = '/fg/R15BpcvZyr7Iuqd8RBEF0tPOWODfKvR6Fm6mxjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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