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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34b8a722bdd97b065b1e81e3b57e1fbb00c1e7ea6b3add6d855b69fa47a7a4f7' 
  AND token = 'GZ+3vEKRnfsa+FJ7ehfPmMiEO9XJJM5InNvTWzRTV8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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