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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acfbbb8ad41d578482ef4d4577be8b3a6d76c4f0a05f4a11619319cc6aaf8ce9' 
  AND token = 'XmGn4/RWsvydtiXbs84+fXZ0pZKhc2D0DWmicJzfDcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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