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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91a1897a2093575ea82e0dce096f771a894155cca854c85be106f0c27f5beb9c' 
  AND token = 'dMQWZegO6GLIpHX440lBxxNQUk9N3l0re6kWNJSKmuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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