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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb87631785272fcf13c557434d082e9c28ee443f6adb8c5635f322348de1368f' 
  AND token = 'iDcU0m9J973S3/rmjOfXgpl3aH+k14aEELzFUCsR6P4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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