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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11d4e8e7750c2b38566c3bfe0c630de0de18764f95dcbc182d00c37a99142dee' 
  AND token = '/AS1eO3k9JkKtD2SgMDvY13LAaHLe9Ro5juXurGNg3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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