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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11372456f3a94a187e2f106f1068d6e32789a464c292b5efc5553e172143d162' 
  AND token = 'NZRflQb8uiEItJh1ZCQFCbzbcN8unUxZf9tWJReXlHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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