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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2bac6fbd41726fd5ec27c596038ac302edd0b315a43d9c41c3d2c6fd945d904' 
  AND token = 'Ej8hAJ31L0vSdWcN8ifE/w7wZ1XvoxaeAN85FJfITlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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