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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b71f9249d5f7c714b9b9e2ee95723a0905d2c1c39dc380cea7307b558977692' 
  AND token = 'hWs+zcfHxz+80R3WHFds/eJRu5djdPsJok61rTTNXYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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