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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b451ff0ecab25d2b34b9facc8024b13b25596e612939a479fe770c914286407' 
  AND token = 'sKk1oLG2yAJVEU5CWBwqjuu7JYtRnN2X2FWbBtyeKME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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