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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d6a8ce4e89bb8a858a6bf9d67cb644a1e8b4b509aa6d0e4d9b7cd102b2766c0' 
  AND token = 'aXkNu3lTEyR6uI3/B2rIC0msNZlQOmfB7YmtAiEFsAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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