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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '385e8639bcaccd6413b9aa35036b5d45cea2cac8b1f468eaccf72e44ea3934ef' 
  AND token = 'IgD3KpUSYdPzdiYvNQGdyOyYJNXYj1jNyj0n+/8VY2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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