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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a833aa31edfcfae7acb9dfc90812e405a23845a5f8fe04b879f4b813e2e3cba' 
  AND token = 'tNZs8g14wfEBdVkVFO4gjI53Uu4IW/7QAZwY2IIA4nM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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