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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1611b11fdbd212806917e8268676c7beff4ae148ddff70d1f35dbd656f2acf4' 
  AND token = 'L3aTEvBrONHjAa3w2VIN8pYuRM0CQlW4AK5UxUmi5IY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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