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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ab5cf66af8144acc45b830e42eb9be3eb24c63d6e9ac7458e6dd0d54841eb9a' 
  AND token = '4fAbyQomNVpY4iKxJpwPeEZxSaYMVabMWxEc0g+S/LI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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