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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f97b4c4f3c4021df22d349cb3cda4d2efa8bd1af4b2f7593917b38bcfb79f33e' 
  AND token = 'IzMe02CW27jU4c/l95dk2Ckjnh9pSABS9+a+Z3KXGSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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