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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79424e3b9b2d5c1824fa6d43856a6c7538217ef17170bde74379f1ee1a06057c' 
  AND token = 'XbACdxHqFxINvrHQkKcvY1hxz8+U/I4/p97Y0yJ083I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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