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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a20b96d5f88b2e2ef8726a8d5359ba58f0cdf4116c1b8dec382923d478264f1' 
  AND token = 'gUEQrT57w4yYqEJjI3z+k4oCaWk45QshMhC9w4FWLI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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