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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91c9659f5512930c741687a1d427d607c099870396e889bcc76f637418f3e2bb' 
  AND token = 'hv110PvOB48GkGIFnui5o8qYtRLAP8OSbQvf+jefsLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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