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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfd6a3173556f5fb342066a4d3b6ae71bcad882a98375336a4fe5be7991f8788' 
  AND token = 'qQh5XwoaRbeeHk3BhXSqz77PWv1/L43+E/ah2sKqbKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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