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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee5386bc78d0d0f2b7a31e5dc5d814967d15c3635e17c3fac14f66f6e5b4977f' 
  AND token = 'oYs84Dhs91XIWA8eh3jOlvwc7fXq0zD1nG/cut0Dm/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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