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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50d3d83d73653eed3c5b1bee325314bd37e4e7e9b6d4f3b165866f0fb9aeec47' 
  AND token = '93A9HKtzE02bdt3BHihWEWJx1XdNgL7FAa313DI3Euw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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