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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '917333864ca0f770f1895643a1afda01cfa432794628ddc3b2016d8d65610053' 
  AND token = 'J+i/E3jif5E+ascjrfnUh1pEvx5IqM5TJiBkMaSm6KU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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