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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88c890c7e069eb77858c96b0770f51d5e0bb042f05b581f904a35b8f0336eeeb' 
  AND token = '2xGk+vTj9rz5XvDw545q6CHrA3LBcP8w0QdPTZeULck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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