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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b3699ff913b8b7ea77766d506bbe95f1133232757946f9ed1574062c4913159' 
  AND token = 'waD+5Of4X51VfGG7N5E0A417kkfoeIoI8f2eNU56C4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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