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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10620e4bc652226256f4ba3bacb8162a60436f63a4cd9075d1ca0c193e9ae896' 
  AND token = 'gFme/XjL6Wt+vH5o3osutaOtPcq3E7bQNS9utH7J/+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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