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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0633a8d8cca3eee07255c86e94a7def2dd49bbe72eb2fcbbde45de8245a2a222' 
  AND token = '7Fbb4sOCvT9SeJ9/PTR0n2v5FWsW9psRgHLNrRR81dI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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