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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc1be6baa972304bd867191d4ee06f6855caa1eb3680854e8f8ad0fa08a92a66' 
  AND token = 'SeILWnARInEfIJBxzCIwznps/36RhG/YZAT3DRr5KW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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