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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03bedadd85c7588a3cc6894f6cdbc18452aa9046ca54829cb4227024a8563cc0' 
  AND token = 'W9jaa4KzV4BBxEoFNF8WiW/M7idFkHz0RrluHQMIl8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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