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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2668d16b778f8b3ea53727104a0ae8e6d110ea14bdc8495375ce3c19ac5f28b1' 
  AND token = '9/PvPdGsjUM4e6s/XkV7DQTAdfYgK13US8V14dNxk8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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