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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '732583b224a4cc337e84d5303904bd81626f3b4531a665284c7f37fcfea207d4' 
  AND token = '1MOeNYXoQspB8lLUT3Ar+bXepG14J0CxnaxTnZ5v9Pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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