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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '359e191a009b1e40c1b19a23ab66f4f6ab4b4310833211f6cc6b3ddee067fd42' 
  AND token = '5wf3npbS0e06+pDzlrgAsA3Gk5pdegGjPYoZAhkptjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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