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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '875a4ca4cbba96eabb46547a9985d907ecb8a1a2dcfacf3dca14d578e09279da' 
  AND token = 'sJd3VL41ACPjwnlB9TKcjFiylqaVO4h8WDJVbycqv2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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