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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22290bb7045f6b8982389218c2af0f6b45dbcad3934927d4627e039abc90d9da' 
  AND token = 'bQhFJkjo3BtwbZu6BixAazNB44GMisTMSGYDbxnf6A4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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