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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c181325fefc819ad31b7c9aee2302ef935a1b0086347ba9b38ff0adb2731a7c' 
  AND token = 'QKm/oX2R7JgV0PB8ZH83143FFuzn8Rwox0SLQOII7qE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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