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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd16d0be4a5f795d7fa599240ea00261fdd9aec952ca34b74f06feef9f758e7f8' 
  AND token = 'd7LoDvUkkj4bhJfMfcvpiV70rmDa+4fpKTWEObcpk/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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