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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e006189d7a332bf907b8329ab72a23b669874b153aedb6b77ea9db594bc0374' 
  AND token = '2tar7LQZbOOknWlBOei/U3m9q842gto/s5BnPpTsCN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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