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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c276a3504cf19e99852ddac87750d963e6ba5c1b9f3d7448101c4323dd6d31d' 
  AND token = 'li3b8JwZbyXrfMKriladX9r6+AuTtnF9gEvWuyXKDbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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