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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9df1dd6e89fca4824c09b9a797c36ada0ccc9091a45579a4d417ef917836167' 
  AND token = 'mI9s/wti0/dVnfmJpH8XkDUSwxs4PceGus5kCZ/n2+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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