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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7dd19d4f3058efd5cf92c85f27a57a6a013cd5ea98735a769131a0c9a124117' 
  AND token = 'brJYiQ4R5tpdcPNsL3ubpohSDcZZE+VsPOv0oAQ/Ums=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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