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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c55b7806bc3ad8930bcaf66d3474cc54a6c7973717ce30f73f1b3f95e9e1bf94' 
  AND token = 'P3Z5c7+oIoGaJXCtcrrQiPRcy1qTA5UtPTTEAn7CIQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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