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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88b09d93c17113e704bf7e13df9c8fe5da5f5b79a4a886c71491f96f88fa1a6d' 
  AND token = 'ViMUrt2XyIcS7+x4j5rA+x6gNhRvNDE+AQCmVU4Bgrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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