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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeb7337d019111335cb913842b70f28c51a4b04406babd4da59956e0a4ad1716' 
  AND token = 'fNBGddlg9h8iFy1aiqq/3tNVYZI+J8+ztzgt+FTGp40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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