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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac9aef6dc1654022ba6b40f42bb09f120bcc37a97e1a9c89ae764c2f6b379980' 
  AND token = 'VHxkpGLIEmjsFQwtfC/SPHbWsPfnvvb9sCF3H3cvXD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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