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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f1d328ab94c28ddbf9e30180d5331a0f5d90b9ab61510c691517b61347cdaab' 
  AND token = '2ygZwgO0MaACuHC8aHW2XUWcIhGgU+b7R+EvZCSve6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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