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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4839b0e86fa9c53d1b11b9a1d7fa33d216e32187c03ca669e58f6862ef32a16' 
  AND token = 'Xz8BYPFB6809rfens8k+k02/qVzIsmjRyvJgRIgYHEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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