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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fdb2ee79a28573b65ecefeb117c691793d9a13bb31365b9e3819ff1ce3d810b' 
  AND token = '3k3qb+twlP1HkELJUohzuM/9Mi5NnXYVU9M6nnmOSAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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