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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed156b5e3629a1e88c8dff058eb54dc97d33c98288f7bb8f4cb6be551cce4d6f' 
  AND token = 'j0g6t3ZSfOv8ltfo+K7Itnp6Ap6HnSRxHQrOBbR6sjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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