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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f6abd8cd1d8ae2ffb18592bbbf9f4b99fabe4b84e8590722f4c4eb1c45f2424' 
  AND token = 'jzBQ0iiK3y/h2nCZ+RuWs/5AFKy4bNp+nqjwYeAM6Fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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