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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b184c713bdde53f7684183eae0ad0435e078ad0ed86c4591863cf529dc44b26' 
  AND token = 'oLSNGrUj4MPm78XRxXDEn58xcft3lDDAFSE/v8QwRSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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