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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e56fde87bcc6c9341d59799e31267f34b3ee185da46fd0f13186681d93f9c5eb' 
  AND token = 'xNwBxEpOvPOzHdyqG0zVtA7fpFA78S9X7YlVp4UdUN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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