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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f43b133e211e4434106aa97b184f7271c5e976fe299ae57f996d52a55d60e9c' 
  AND token = 'JSRalQGEukPwqrnxXoDh6YpyGAbShEh65C2Klk2NKuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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