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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e762194cbd0fbf917bbed25203d0dac371725534bdbe119fa51d4ef91c667ec' 
  AND token = 'W0WzJ02aHtJGS9amz1LmbxlAFx02/g1R/1uCHpcW7xE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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