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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d928a982ae4a41cd1c0216546fba5e2f8e5a3c8d5eff90ebb07f3639b806fb2' 
  AND token = 'Dv3ZK6pOcwSjEhBrx2h8bhAhSBp7BsJ++y0UPrPRtdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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