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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6476c2cf0c9c8887c105450c3ad69b3f5e3524665ec89afbad0337bf0c341af7' 
  AND token = 'iOz9fH4JHEPfUnhfKj87w/38gOYkg/Zd8/jl7pKuecU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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