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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffea4731f9d0050ec6eb5678cc5f961e16eb0d9ecf177738411f580fdf1ac5b9' 
  AND token = 'zf6GjNoCq2m13JB9j0C23TgdHJbfjF5urVnp14Kl5Dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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