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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90290ce9e567330891df21859d822699fb70d496ca5b683e55fab0809975e7ea' 
  AND token = 'o/rOLABkmREQmlQU6y0DN838iSeUzbpLXm83FAbdi7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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