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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da3db80c52b18db7ad427c9dafaeca7f69e46a1db9e7076f46960dca8d049a56' 
  AND token = 'VU2MgofDu+ilX8Be51h8bWaaj8N3HgqzCMpgq3R2WKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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