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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb920b7e95c4185d75049bdb1f3b8806ed58245b20694f9bab7090dd6332952f' 
  AND token = 'bCPylTJz9Ze6ZMsGHoevaI9cwmDl+Qz67qUo51MF0D8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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