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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f136335cb88e6dacfa88143367dbca07719866e052a229d617ebcfe75de3f4c1' 
  AND token = 'b7T5cFUOyqgZfcl+61PHznWsMaJm9klwIFn9qpb5vaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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