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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab6f765fb3d47c51713e96594720a3e5fcbe5aa7608bf87924fb1aa63096e1eb' 
  AND token = 'JYyvLYyh2qAk7c+htpRYxIy/WwloEQrXaY0x/nL4jWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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