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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9464d4355c58e391181f5bbaee700b6712c4eb9be1add2d10aeafe5f9f50693' 
  AND token = 'ZcEyiCAN002CSlPOpStzoucpNHjtL95C4faU9ui6eVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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