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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd791037b99a3c5dce6b1bb1dd52013d56a33b4267ff3fb3be626e30a15f4100d' 
  AND token = '6f1JeyTQgAvg5yOHLxbaW8efd69L+jqHo7k4IS9kWJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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