SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2edf36e1afbce4fc1189bcb19b8932de49550239b34696c9f6b1196ff4248d28' 
  AND token = 'UW+cz2kwvZl7GlQpmJiCs6L/x4FPjMj8yG8+5PlNw5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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